﻿274 
  E. 
  B. 
  Branson 
  — 
  Geologic 
  Section 
  in 
  Missouri. 
  

  

  old 
  valleys. 
  The 
  Sylamore 
  is 
  almost 
  continuous 
  from 
  

   the 
  eastern 
  part 
  of 
  the 
  section 
  to 
  the 
  western. 
  In 
  most 
  

   places 
  it 
  underlies 
  the 
  Chouteau 
  limestone 
  but 
  it 
  lies 
  on 
  

   Snider 
  Creek, 
  Callaway, 
  Mineola, 
  Cooper, 
  Kimmswick, 
  

   Joachim, 
  St. 
  Peter, 
  and 
  Jefferson 
  City. 
  Its 
  relation- 
  

   ships 
  to 
  the 
  underlying 
  rocks 
  include 
  all 
  of 
  those 
  dis- 
  

   cussed 
  in 
  the 
  last 
  paragraph. 
  The 
  Sylamore 
  bears 
  a 
  

   basal 
  Mississippian 
  fauna 
  which 
  is 
  illustrated 
  and 
  dis- 
  

   cussed 
  in 
  a 
  paper 
  soon 
  to 
  appear. 
  

  

  The 
  Sylamore 
  varies 
  in 
  color 
  from 
  light 
  gray 
  through 
  

   grayish 
  green 
  to 
  dark 
  brown. 
  In 
  Warren 
  County 
  it 
  has 
  

   been 
  mistaken 
  for 
  the 
  Ferruginous 
  sandstone 
  of 
  the 
  

   Pennsylvanian. 
  The 
  greenish 
  phase 
  is 
  peculiar 
  and 
  

   recurs 
  in 
  places 
  from 
  southwestern 
  to 
  northeastern 
  Mis- 
  

   souri. 
  In 
  a 
  few 
  places 
  shales 
  are 
  associated 
  with 
  the 
  

   sandstone 
  and 
  may 
  occur 
  above 
  or 
  below 
  it. 
  

  

  The 
  Sylamore 
  has 
  been 
  considered 
  as 
  part 
  of 
  the 
  

   Chouteau 
  or 
  part 
  of 
  the 
  Devonian 
  by 
  most 
  investigators 
  

   of 
  this 
  region. 
  

  

  The 
  Chouteau 
  Limestone 
  (KinderhooMan) 
  . 
  — 
  Through 
  

   much 
  of 
  the 
  section 
  the 
  Chouteau 
  limestone 
  rests 
  on 
  the 
  

   Sylamore. 
  The 
  transition 
  from 
  the 
  Sylamore 
  to 
  the 
  

   Chouteau 
  is 
  usually 
  brought 
  about 
  by 
  the 
  presence 
  of 
  

   shale, 
  two 
  or 
  three 
  inches 
  thick, 
  which 
  bears 
  a 
  typical 
  

   Chouteau 
  fauna. 
  The 
  Chouteau 
  consists 
  of 
  dark-colored 
  

   argillaceous 
  limestone 
  below, 
  and 
  light-colored, 
  sandy 
  

   dolomite 
  above, 
  but 
  the 
  dolomite 
  occurs 
  only 
  where 
  

   the 
  formation 
  is 
  thick. 
  In 
  Cooper 
  and 
  Pettis 
  counties 
  the 
  

   upper 
  half 
  contains 
  a 
  great 
  deal 
  of 
  sandstone. 
  In 
  the 
  

   eastern 
  60 
  miles 
  of 
  the 
  section 
  the 
  formation 
  has 
  been 
  

   observed 
  in 
  only 
  one 
  place, 
  and 
  is 
  absent 
  through 
  most 
  

   of 
  the 
  distance. 
  Near 
  Fulton 
  it 
  is 
  one 
  foot 
  to 
  two 
  feet 
  

   thick 
  and 
  thickens 
  to 
  60 
  feet 
  in 
  the 
  bluifs 
  of 
  the 
  Missouri, 
  

   25 
  miles 
  west 
  of 
  Fulton. 
  West 
  of 
  the 
  Missouri 
  Eiver 
  it 
  

   averages 
  50 
  to 
  60 
  feet 
  thick 
  to 
  Pettis 
  County 
  where 
  it 
  

   dips 
  under. 
  

  

  The 
  Chouteau 
  seas 
  were 
  patchy 
  along 
  the 
  middle 
  part 
  

   of 
  the 
  section 
  and 
  had 
  withdrawn 
  slightly 
  from 
  their 
  

   Sylamore 
  boundaries. 
  The 
  Sylamore 
  keeps 
  its 
  thickness 
  

   in 
  areas 
  where 
  no 
  Chouteau 
  is 
  present 
  though 
  that 
  thick- 
  

   ness 
  is 
  only 
  one 
  or 
  two 
  feet. 
  On 
  the 
  other 
  hand, 
  the 
  

   Chouteau 
  remains 
  limestone 
  to 
  the 
  edge 
  of 
  the 
  various 
  

   patches 
  showing 
  that 
  little 
  or 
  no 
  erosion 
  took 
  place 
  on 
  

   the 
  exposed 
  Sylamore 
  flats. 
  

  

  